Finding the Fourth Proportional to 156,648.27, 216,174.78 and 85,028.28

Step by Step Solution

1. Step 1: Write the proportion equation
   156,648.27 : 216,174.78 = 85,028.28 : x
2. Step 2: Convert to fraction form
   156,648.27/216,174.78 = 85,028.28/x
3. Step 3: Cross multiply
   156,648.27x = 216,174.78 × 85,028.28
4. Step 4: Simplify right side
   156,648.27x = 18,380,969,722.78
5. Step 5: Solve for x
   x = 18,380,969,722.78/156,648.27
6. Step 6: Final answer
   x = 117,339.12